Fix issues identified by Julia Package Butler

.github/workflows/jlpkgbutler-ci-pr-workflow.yml

@@ -31,3 +31,9 @@ jobs:
       - uses: julia-actions/julia-uploadcodecov@latest
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+  formatlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1.0.0
+      - uses: julia-actions/setup-julia@latest
+      - uses: julia-actions/julia-codeformat-lint@releases/v1

.github/workflows/jlpkgbutler-codeformat-pr-workflow.yml

@@ -0,0 +1,23 @@
+name: Code Formatting
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: julia-actions/setup-julia@latest
+      - uses: julia-actions/julia-codeformat@releases/v1
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v1.8.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Format files using DocumentFormat
+          title: '[AUTO] Format files using DocumentFormat'
+          body: '[DocumentFormat.jl](https://github.com/julia-vscode/DocumentFormat.jl) would suggest these formatting changes'
+          labels: no changelog
+          branch-suffix: none

.github/workflows/jlpkgbutler-tagbot-workflow.yml

@@ -0,0 +1,12 @@
+name: TagBot
+on:
+  schedule:
+    - cron: 0 * * * *
+jobs:
+  TagBot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}